South Sudanese Vice President Riek Machar (left) shares a smile with President Salva Kiir after a swearing-in ceremony Saturday in the capital, Juba. Observers hope their newly forged coalition spells an end to civil war.

South Sudanese Vice President Riek Machar (left) shares a smile with President Salva Kiir after a swearing-in ceremony Saturday in the capital, Juba. Observers hope their newly forged coalition spells an end to civil war.